Hi there i also have the exact same symptoms. In fact i am on the couch now with both feet up as i can't walk. I also have not ridden for four days and when i am relaxing or going about my day to day activities, i get what is like a crap or a contraction of both of my quads.I have now had my cramps for two constant days on and off and have never experienced anything liike this before. I went to an acupuncturist today as well as a masseur and no luck. I have a gym and fitness back ground and i understand DOMS, yet i would not call this feeling DOMS. As there was no initial lead up and the last ride i went on was a recovery ride which i found easy. I am wanting to know how you went in dealing with this problem???